The area of the retina that is richest in photoreceptors is called the ________
a. choroid
b. fovea
c. sclera
d. optic nerve
b
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Release of cross-bridges depends most directly on
A. calcium ions. B. potassium ions. C. adenosine diphosphate. D. adenosine triphosphate. E. creatine phosphate.
Radioactive isotopes have
a. excess electrons. b. excess protons. c. excess neutrons. d. insufficient neutrons. e. insufficient protons.
Most pathogens that gain access through the uninjured skin
A) Just infect the blood below the skin. B) Penetrate a cut or puncture. C) Must be injected. D) Enter through hair follicles and sweat ducts on the skin. E) Must be carried by a parasite to allow them to penetrate.
Which of the following are found in both DNA and RNA?
a. phosphate groups, guanine, and cytosine b. phosphate groups, guanine, and thymine c. deoxyribose, phosphate groups, and guanine d. ribose, phosphate groups, and adenine